[Malocclusions in children with black tartar]

The author studied the prevalence of occlusal anomalies in children with black tartar treated in the Mother and Child Institute Branch in Rabka. The prevalence of these anomalies in these children was lower than in children without this tartar. In boys this difference was highly significant statistically, while in girls the difference was lower and not significant statistically. In boys with black tartar the prevalence of occlusal anomalies was 14% lower and in girls about 4% lower.